Mass Mobs

Mike Householder / AP

In this photo taken on Oct. 12, 2014, Detroit Archbishop Allen Vigneron delivers his homily during Mass at St. Francis D'Assisi Church in Detroit. Building on the idea of flash mobs, a group called the Detroit Mass Mob picks one historic Roman Catholic church per month and encourages area worshippers to show up for a service.

In this photo taken on Oct. 12, 2014, Detroit Archbishop Allen Vigneron delivers his homily during Mass at St. Francis D'Assisi Church in Detroit. Building on the idea of flash mobs, a group called the Detroit Mass Mob picks one historic Roman Catholic church per month and encourages area worshippers to show up for a service.